Introduction to GraphQL for Android dev

Transcript

1. INTRODUCTION TO GRAPHQL Ivan Savytskyi Android Developer @Shopify
2. GraphQL
3. What is GraphQL GRAPHQL IS A QUERY LANGUAGE FOR YOUR API, A N D A S E RV E R - S I D E R U N T I M E F O R E X E C U T I N G QUERIES BY USING A TYPE SYSTEM YOU DEFINE FOR YOUR DATA.
4. DEMO
5. Client RestAPI /users getUserList user list (length: n) RestAPI /user/repo/{:id} getUserRepo(id:1) getUserRepo(id:2) getUserRepo(id:n) R : 1 R : 2 R : 3 R : n+1 N + 1 query problem Client GraphQL Server getUserWithRepos user with repo list REST GraphQL R : 1
6. GraphQL Schema "kind": "OBJECT", "name": "User", "description": "A user is an individual's account on GitHub that owns repositories and … "fields": [{ "name": "avatarURL", "description": "A URL pointing to the user's public avatar.", "args": [{ "name": "size", "description": "The size of the resulting square image.", "type": { "kind": "SCALAR", "name": “Int" }, "defaultValue": null }], "type": { "kind": "NON_NULL", "ofType": { "kind": "SCALAR", "name": "String" } }, "isDeprecated": false, "deprecationReason": null
7. … "name": "gist", "description": "Find gist by repo name.", "args": [{ "name": "name", "description": "The gist name to find.", "type": { "kind": "NON_NULL", "name": null, "ofType": { "kind": "SCALAR", "name": "String", } }], "type": { "kind": "OBJECT", "name": "Gist" }, "isDeprecated": false, "deprecationReason": null GraphQL Schema
8. Graph Root User Repo Search Gist Connection Gist Repo Connection PullRequest Connection PullRequest description, isDeprecated fields: [ avatarUrl:String, bio:String, …
9. GraphQL
10. Schema only generation ApiSchema.query( root -> root.user( args -> args.login(“efung”), user -> user .name() .bio() .avatarURL(args -> args.size(48)) .company() .repositories( args -> args.first(100), repo -> repo .id() .name() ) ).build() query{ user(login:”efung”){ name bio avatarURL(size:48) company repositories(first:100){ node { id name } } } }
11. Schema + query generation /src/graphql/com/example/schema.json /src/graphql/com/example/query.graphql query UserWithRepos($login:String!){ user(login:$login){ name bio avatarURL(size:48) company repositories(first:100){ node { id name } } } } class UserWithRepos{ final String OPERATION_DEFINITION = “” class Variables{ String login; } class User{ String name; String bio; String avatarURL; String company; RepositoryConnection repositories; class RepositoryConnection{ List<Node> nodes; class Node{ String id; String name; } } } } http://dev.apollodata.com/
12. Q&A THANK YOU